There is a service out there that will
AUTOMATICALLY backup what you have on on-line sites... emails, files, pictures. It's called Backupify. It is a pay service unfortunately, and has some limitations, but not having to do it yourself is a big attraction for me.
The link, if you're interested (and no, I don't have an account or any affiliation with them... just read a review and think it's a good idea
):
Backupify :: Secure Online Backup and Archiving for Gmail, Facebook, Twitter, and Wordpress
or read a brief review here:
Backupify Automatically Creates Backups Of Your Online Belongings